Ich habe folgenden Code genommen.
Klappte bis jetzt immer einwandfrei.
Aber es wird auf einmal bei gefühlter Temperatur nur noch --.- C angezeigt.
Keine Werte mehr.
Kann mal bitte jemand überprüfen wo ich den Fehler habe ?
Danke
// Temperature and humidity meter with LCD and DHT22
// Programa uses ADafruit DHT library https://github.com/adafruit/DHT-sensor-library
// and LCD Library https://github.com/adafruit/Adafruit-ST7735-Library https://github.com/adafruit/Adafruit-GFX-Library
// LCD connection
#define cs 10
#define dc 9
#define rst 8
#include <Adafruit_GFX.h>
#include <Adafruit_ST7735.h>
#include <SPI.h>
#include <stdio.h>
#include "DHT.h"
#define DHTPIN 2// DHT22 data pin is connected to Arduino 7 pin.
#define DHTTYPE DHT22
DHT dht(DHTPIN, DHTTYPE);
#if defined(__SAM3X8E__)
#undef __FlashStringHelper::F(string_literal)
#define F(string_literal) string_literal
#endif
Adafruit_ST7735 tft = Adafruit_ST7735(cs, dc, rst);
//Black theme
#define COLOR1 ST7735_WHITE
#define COLOR2 ST7735_BLACK
#define COLOR3 ST7735_YELLOW
#define COLOR4 ST7735_GREEN
//White theme
//#define COLOR1 ST7735_BLACK
//#define COLOR2 ST7735_WHITE
int text_color_humidex;
float humidity, temperature,humidex;
String message;
void setup(void) {
dht.begin();
tft.initR(INITR_BLACKTAB); // initialize a ST7735S chip, black tab
tft.fillScreen(COLOR2);
}
void loop() {
// get data from DHT22
humidity = dht.readHumidity();
temperature = dht.readTemperature();
//humidex is calculated
humidex = calculate_humidex (temperature, humidity);
// Table
tft.drawRect(0, 0, 128, 160, COLOR1);
tft.drawLine(0, 50, 128, 50, COLOR1);
tft.drawLine(0, 100, 128, 100, COLOR1);
// data is outputed
temperature_to_lcd (temperature, 4);
humidity_to_lcd (humidity, 55);
humidex_to_lcd (humidex, 105);
}
// outputs temperature to LCD
void temperature_to_lcd (float temperature, unsigned char text_position )
{
int text_color;
tft.setCursor(4,text_position);
tft.setTextColor(COLOR1,COLOR2);
tft.setTextSize(1);
tft.print("Temperature:");
tft.setTextSize(3);
if (temperature>0) {
text_color=ST7735_BLUE;
}
else {
text_color=ST7735_RED;
}
tft.setCursor(1,text_position+20);
fix_number_position(temperature);
tft.setTextColor(text_color,COLOR2);
tft.print(temperature,1);
tft.setCursor(108,text_position+20);
tft.print("C");
tft.drawChar(90,text_position+20, 247, text_color, COLOR2, 2); //degree symbol
}
//outputs humidity to LCD
void humidity_to_lcd (float humidity, unsigned char text_position )
{
tft.setTextColor(COLOR3,COLOR2);
tft.setCursor(4,text_position);
tft.setTextSize(1);
tft.println("Luftfeuchtigkeit:");
tft.setTextSize(3);
tft.setCursor(1,text_position+20);
fix_number_position(humidity);
tft.print(humidity,1);
tft.print(" %");
}
//outputs Humidex to LCD
void humidex_to_lcd (float humidex, unsigned char text_position )
{
tft.setCursor(4,text_position);
tft.setTextSize(1);
tft.println("Gefuehlte Temperatur");
tft.setTextSize(3);
tft.setCursor(1,text_position+17);
if ((humidex >= 21 )&&(temperature < 44)) {
fix_number_position(humidex);
get_humidex_color_warning_message(humidex);
tft.setTextColor(text_color_humidex,COLOR2);
tft.print(humidex,1);
tft.setCursor(108,text_position+17);
tft.print("C");
tft.drawChar(90,text_position+17, 247, text_color_humidex, COLOR2, 2); //degree symbol
tft.setCursor(3,text_position+43);
tft.setTextSize(1);
tft.print(message);
}
else {
tft.print(" --.-");
tft.setCursor(108,text_position+17);
tft.print("C");
tft.drawChar(90,text_position+17, 247, COLOR1, COLOR2, 2); //degree symbol
tft.setCursor(1,text_position+43);
tft.setTextSize(1);
tft.println(" ");
};
}
// aligs number to constant position
void fix_number_position(float number)
{
if ((number >= -40)&&(number < -9.9))
{
;
}
if ((number >= -9.9)&&(number < 0.0))
{
tft.print(" ");
}
if ((number >= 0.0 )&&(number < 9.9))
{
tft.print(" ");
}
if ((number >= 9.9 )&&(number < 99.9))
{
tft.print(" ");
}
if ((number >= 99.9 )&&(number < 151))
{
tft.print("");
}
}
//function to calculete Humidex
float calculate_humidex(float temperature,float humidity) {
float e;
e = (6.112 * pow(10,(7.5 * temperature/(237.7 + temperature))) * humidity/100); //vapor pressure
float humidex = temperature + 0.55555555 * (e - 10.0); //humidex
return humidex;
}
// Setting text color and message based on Humidex value
void get_humidex_color_warning_message(float humidex)
{
if ((humidex >= 21 )&&(humidex < 27))
{
text_color_humidex=tft.Color565(0, 137, 0);
message= "Optimale Temperatur ";
} // dark green
if ((humidex >= 27 )&&(humidex < 35))
{
text_color_humidex=tft.Color565(76, 255, 0); // light green
message= "Unbehagen ";
}
if ((humidex >= 35 )&&(humidex < 40))
{
text_color_humidex=tft.Color565(255, 255, 0);
message= "Viel zu warm ";
} // yellow
if ((humidex >= 40 )&&(humidex < 46))
{
text_color_humidex=tft.Color565(255, 140, 0);
message= "Verdammt heiss ";
} //light orange
if ((humidex >= 46 )&&(humidex < 54))
{
text_color_humidex=tft.Color565(221, 128, 0);
message= "Great health risk ";
} //dark orange
if ((humidex >= 54 ))
{
text_color_humidex=tft.Color565(255, 0, 0);
message= "Heat stroke danger ";
} // red
}
